No, I don't agree, I am talking in general, and in general, in the UK the public don't encounter armed Police officers too often. As opposed to in the US where all of them are, and who take their own safety, understandably, very seriously.
An unarmed officer really has very little in the way of options, and in the days before ARV's, I walked into things I really didn't want to, where the proper response would have been an armed officer. We did have them but the authority of God himself was needed to have them issued at Station level, and the Good Old DPG were like London Cabs, "Naw mate, that's south of the thames, we'll melt or something".
So yes we made do. Some got killed as a result, but dead police officers are good publicity opportunities for Politicians, it means they can lie some more, without being questioned to closely, because it would be disrespectful.
That we did make do, really acceptable any more. Yes, I signed on the dotted line, but it didn't say anything about being expected to die in the attempt to do my job. So, while I am not keen on Police officers with guns, mostly because of the way the idiots at the IPCC behave, I accept they are now necessary.
Those that carry firearms and use them in crime, are slowly cottoning on that the Bill have a bit more than 12 inches of cheap wood, an asp or some mild korma sauce to spray at them. So while we in the UK are still learning that having a firearm and being stupid/criminal is likely to hurt....a lot, the US have known the consequences for years. It's obviously sad that a 13 year old lost his life, but it's inevitable that it will end badly unless you either don't carry anything that looks like a gun, or you do exactly what you are told when the filth turn up.